Vulnerability · CVE-2025-4035
A flaw was found in libsoup.
Published Apr 29, 2025 · catalog updated Jun 30, 2026 · Red Hat Red Hat Enterprise Linux 10
Check if you run it
No confirmed exploitation is on record for CVE-2025-4035. EPSS is 0.44%. Act only if a listed version of Red Hat Red Hat Enterprise Linux 10 is installed.
Gaps on this record
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- Medium4.3
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.44%
- Remediation
- Advisory link
- Affected products
- vendor Red Hat Red Hat Enterprise Linux 10 patch: 0:3.6.5-3.el10_0.6
A flaw was found in libsoup. When handling cookies, libsoup clients mistakenly allow cookies to be set for public suffix domains if the domain contains at least two components and includes an uppercase character. This bypasses public suffix protections and could allow a malicious website to set cookies for domains it does not own, potentially leading to integrity issues such as session fixation.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- vendor Red Hat Red Hat Enterprise Linux 10 patch: 0:3.6.5-3.el10_0.6patch: 0:3.6.5-3.el10_0.6
How to fix CVE-2025-4035
Recommended remediation
A patch or advisory reference is linked. Open the original publisher for availability by product version.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2025-4035. EPSS is 0.44%. Act only if a listed version of Red Hat Red Hat Enterprise Linux 10 is installed.
Which versions are affected?
Compare what you have installed with Red Hat Red Hat Enterprise Linux 10 patch: 0:3.6.5-3.el10_0.6 patch: 0:3.6.5-3.el10_0.6. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
No weakness class is stored. EPSS 0.44%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Apr 29, 2025 · EUVD
Detected
A flaw was found in libsoup. When handling cookies, libsoup clients mistakenly allow cookies to be set for public suffix domains if the domain contains at least two components and includes an uppercase character. This bypasses public suffix protections and could allow a malicious website to set cookies for domains it does not own, potentially leading to integrity issues such as session fixation.
Jun 30, 2026 · EUVD
Updated
A flaw was found in libsoup. When handling cookies, libsoup clients mistakenly allow cookies to be set for public suffix domains if the domain contains at least two components and includes an uppercase character. This bypasses public suffix protections and could allow a malicious website to set cookies for domains it does not own, potentially leading to integrity issues such as session fixation.
Sources
- CVE.orgVulnerability recordCVE-2025-4035
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2025-4035
30-day exploitation probability 0.4%
first.org - EUVDVulnerability recordEUVD-2025-15014
A flaw was found in libsoup. When handling cookies, libsoup clients mistakenly allow cookies to be set for public suffix domains if the domain contains at least two components and includes an uppercase character. This bypasses public suffix protections and could allow a malicious
euvd.enisa.europa.eu
References
Freshness
Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.